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Re: Faster shutdown and the ubuntu "multiuser" update-rc.d extention

On Thu, Jan 03, 2008 at 10:48:01PM +0100, Gabor Gombas wrote:
> On Thu, Jan 03, 2008 at 10:40:32AM -0800, Steve Langasek wrote:

> > It's also, as commented already in the init script, recognized as a bug in
> > the associated daemon.  Fixing that bug would drop the need for the sleep,
> > though if there's a possibility of SIGKILL coming before the daemon is done
> > shutting down then you still don't have a guaranteed cleanup, and there's no
> > good "wait for process termination" facility that we can use from init
> > scripts.

> Yep, "waiting for an unrelated process to exit" is surprisingly hard to
> do correctly. I wonder if the processor connector support in recent
> kernels could be used to create a "kill_and_wait" utility:

> - start listening on netlink for process-related events
> - send the signal to the process
> - wait until we receive a notification that the process has died (or a
>   timeout has occured).
> - from time to time do a kill(pid, 0) just to be sure we did not loose
>   netlink messages

In that case, why would we not just migrate toward upstart as an init with
service supervisor capabilities? :)

Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek@ubuntu.com                                     vorlon@debian.org

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